Abstract: Method and device for molding integrated circuit packages using dambarless lead frames are disclosed. The mold dies and the lead frame have means for preventing resin leakage out of the mold dies during the package molding step. The leakage preventing means may comprise a tape put on the leads, an enlarged area sections provided on each lead and notches formed on each lead. The leakage preventing means may comprise projections formed on a lead pressing frame of one of the mold dies. In another embodiment, an auxiliary lead frame, which has a plurality of rectangular openings and will be fixed to a bottom mold die, is used as the resin leakage preventing means. When using the auxiliary lead frame, the dambarless lead frame is laid on the auxiliary lead frame and clamped by a top mold die. The enlarged area sections may be formed on the inner leads exclusively or on both the inner and outer leads.

Abstract: A method for producing a plastic molding having a core and a foam with a skin on an outer surface of the core wherein a foaming material is foamed in a space defined between a skin member and the core, disposed within a molding die assembly having an upper die and a lower die includes disposing the skin member which is provided with edge portions that are bent backward to define side portions and engaging recesses provided on the side portions or in the vicinity thereof, on the lower die of the molding die assembly that is provided with engaging projections corresponding to the engaging recesses of the skin member, so that the engaging projections of the lower die are fitted in the corresponding engaging recesses of the skin member to position and hold the latter; disposing the core which is provided with side walls which define a foaming material receiving portion on the die surface of the upper surface of the die assembly, so that the skin member is fitted in the foaming material receiving portion; and pour

Abstract: A method of making a transfer molded chip carrier. A semiconductor device (10) is first electrically and mechanically attached to a substrate (12). The substrate (12) is then treated by sputter etching so that it will provide good adhesion between the substrate and a molding compound (18) that is subsequently molded to the substrate (25). Portions of the treated substrate are then selectively contaminated in order to reduce the adhesion between these selected portions of the substrate and the molding compound. The molding compound is then formed around the semiconductor device so as to encapsulate it and also part of the surface of the substrate. Portions (20) of the transfer molded material that were molded over the selectively contaminated portions of the substrate (12) are then removed by breaking away.

Abstract: To encapsulate IC chips or other parts located in openings in a tape carrier, upper and lower mold halves are closed forming a cavity about each chip. The lower mold half has a lower mold part containing a lower cavity half, and a front wall extending down to a runner groove. A slide normally covers the runner groove and contains runner channels leading to a small side gate in each cavity, without any plastic contacting the tape. After molding the upper mold half is raised and ejector pins push the molded parts with it, away from the lower mold half, performing auto degating. The molded parts are then ejected from the upper mold half, the slide is retracted and the plastic in the runner system is ejected. This allows reel to reel encapsulation of chips or other parts on a tape.

Abstract: A device for molding foam products comprising upper and lower portions cooperable to form a foam mold defining a mold cavity therein. The upper mold portion has at least one vent hole therein. A mechanism for providing the mold cavity with an expandable foam during a filling cycle is also provided. The expandable foam reactively expands when provided within the cavity so as to be molded into the shape of the cavity during a foaming cycle. The foam approaches the vent hole while expanding within the mold cavity during the foaming cycle. At least one vent hole provides a passage through which air and reaction product gases introduced into the cavity as a byproduct of the reactive expanding of the foam can escape to atmosphere from the cavity during the foaming cycle. A sensing and signal generating assembly detects the presence of the foam at a predetermined proximity to the at least one vent hole during the foaming cycle and generates a signal in response to the detection.

Abstract: A method is provided for forming a thermally enhanced molded cavity package of a type which includes a lid and which is for housing a microcircuit chip. The molded package includes a heat spreader and a lead frame. The method includes the steps of attaching the lead frame to one surface of the heat spreader. A mold press is secured or clamped to-the lead frame and to the opposite surface of the heat spreader. Molding compound is injected into the press to form the package body having an upper and a lower section. During molding, a cavity is provided in the package body having the first surface of the heat spreader as a cavity floor and a lid seat is constructed in the upper section of the package body for maintaining a lid received thereon substantially parallel with respect to the cavity floor. The heat spreader is bonded to at least one of the package body sections and to at least one of the leads of the lead frame.

Abstract: A method of forming a molded plastic package having an integrated heat sink, without forming mold "flash" on an external surface of the integrated heat sink during the molding process, is described. The method generally follows conventional fabrication steps for molded plastic packages, except that a protective layer, preferably formed of a water or chemically soluble paste, or a high temperature adhesive tape, is applied to the external surface of the heat sink prior to the formation of the molded plastic package. The protective layer prevents mold "flash" from forming between the external surface of the heat sink and an inner surface of the mold during the molding process, and after formation of the molded plastic package, acts to protect the external surface of the heat sink from scratches and/or contaminants.

Abstract: A mold apparatus and method for forming encapsulated glass which includes the use of a plurality of mold sections 10 and 12 which, when closed, cooperate with a sheet 5 and at least one seal 25 to define a gasket forming cavity 35. When a gasket forming material is injected into the gasket forming cavity 35 and is allowed to at least partially cure, a gasket 2 is formed on at least a portion of the sheet 5 to produce a window gasket assembly 50. A seal 25 with an outwardly angled facing portion 27 defines an interior face 37 of the gasket forming cavity 35 and prevents leakage of the gasket forming material and the formation of flash on the sheet 5. In one embodiment of the invention, the mold section 12 is made of a resilient material and mold section 10 is made of a rigid material. In another embodiment of the invention, mold section 12 has positioned therewithin a rigid member 45 having a finishing surface 48 which cooperates with the seal 25 and the sheet 5 to define a gasket forming cavity 35.

Abstract: A plastic liner for protecting concrete manhole interior surfaces from corrosion wherein the liner includes provisions for creating a strong mechanical lock between the liner and the interior surfaces. A side of the liner which includes the provisions has a plurality of raised hollow projections with spaced sections. The mechanical lock is created when concrete is poured against the side of the liner with the projections. The concrete at least partially enters the hollow portions and fills spaces between the projection sections. The projections also intersect to enhance the mechanical lock by preventing bulging. Liner sections cover essentially all of the manhole interior surfaces. Forming a liner section by rotationally molding the plastic and cutting gaps into the projections is also disclosed.

Abstract: A novel method of molding an article includes providing a mold with a vent of a pre-determined size such that, due to the difference in viscosities, gases to be vented from the mold may easily pass through the vent while the material to be molded cannot quickly pass through the vent. In fact, the vent is designed such that the material to be molded which enters the vent, does not exit the end of the vent. In the most preferred embodiment, the vent is in the form of a thin ribbon-like groove so that the material to be molded which does enter the vent forms a thin ribbon of extruded material which need not be removed prior to a finish cover being applied to the molded article.

Abstract: A method is disclosed for attaching a fastening tape to a molded article and also a mold is disclosed for forming a cellular plastic or foam product for use as a cushioning material for an automobile seat or backrest.The fastening tape is typically in the form of a velcro-like or surface-type fastener carrying on one side thereof a multiplicity of hooks and on the other side a plurality of anchoring members to anchor a molding materials M in the mold. A flexible sealing flange is formed on the tape for protecting the hooks against leakage therein of the molding material during the molding operation in which cooperating halves of the mold are closed with pressure-applying means engaged with and urging the tape against a flexible bottom wall of the cavity mold.

Abstract: A mold assembly for molding an elastomeric sealing element onto an annular seal case includes a spring-biased outer sleeve that exerts a clamping force on the seal case during the molding cycle. During the mold closing stroke the leading edge of the sleeve engages the seal case before an uncured elastomeric charge reaches the seal case. The sleeve therefore acts as a flow barrier to limit any outward escape of elastomer from the mold cavity during molding. By isolating the clamping and flow limiting outer sleeve from the hydrostatic molding forces, the spring force applied to the outer sleeve may be reduced and the axial height of the mold assembly may also be reduced.

Abstract: A method for encapsulating at least a portion of a heat sink insert with plastic material has been provided in which flashing has been eliminated. There is provided a heat sink insert which has a bottom surface, a shoulder portion, and a rib member formed integrally with and extending upwardly from the shoulder portion to define a crush zone. The rib member is deformed to conform with the contour of a cavity formed by the first and second mold plates so as to create a seal between the insert and the cavity. The rib member also serves to compensate for dimensional variations of the insert and the cavity.

Abstract: The storage tank portion of a water heater has an outwardly projecting threaded pipe coupling fitting and is disposed within a jacket structure that forms an enclosed insulation space around the storage tank, the outer end of the pipe coupling fitting being spaced inwardly apart from a pipe connection opening in the jacket structure. A generally tubular foam stop member having a convexly curved side portion is positioned within the insulation space before the space is filled by an injection process with a liquid foam insulation material. The foam stop member receives the pipe coupling, is axially pressed between the storage tank and the jacket structure, and forms a seal around the pipe coupling fitting and around the jacket structure pipe connection opening.

Abstract: A method for producing foam-filled stud walls includes introducing at least a portion of an unfilled stud wall between a backplate, with the sheathing against the backplate, and a dam having a compressible membrane draped over one face thereof and a non-adhering sheet draped over the compressible membrane for presenting to the studs; moving the dam against the bottom portion of the open side of the stud wall; introducing foam between the backplate and the dam to fill the stud wall therebetween; moving the dam while unrolling the non-adhering sheet and compressible membrane; introducing additional foam to fill a further portion of the stud wall; repeating the two preceding steps on to completion of filling; moving the dam away from the stud wall; and advancing the filled portion of the stud wall from between the backplate and dam.

Abstract: A method for forming soft, resilient, smooth, energy dissipating articles from foamed partially cross-linked polyolefins wherein sheet stock is cut into a preform and the preform while at room temperature is positioned within a mold cavity formed by partible mold halves. The preforms and the cavity of the molds are so arranged and constructed that after molding there is no flashing needing trimming because the polyolefin is substantially confined within the cavity without any lateral projection into the parting surfaces of the mold.

Abstract: A method for forming a large thickness flange at an end of a blow molding tube by injection molding using a die assembly. The blow molding tube is sufficiently cooled down before insertion into injection molding dies. The sizes and dimensions of tube holding portions of the injection molding die assembly, which hold the blow molding tube at a portion adjacent to the end, and those of a mating injection molding mandrel are set in conformity to its size and dimension of the blow molding tube after thermal shrinkage thereof caused by cooling of the tube. Thus, any gap between the blow molding tube and injection molding die assembly is eliminated, so that any leakage of molten resin through such a gap between the contact surfaces of the blow molding tube and those of the injection molding dies and mandrel can be perfectly prevented during the injection molding step. For instance, the method is useful for producing an intake manifold used in an automotive engine room.

Abstract: A method and a device for forming a molded portion at an end of an extruded weather strip. The method includes the steps of placing the end of the extruded weather strip made of foamed elastic material in a cavity defined by a movable upper mold member and a fixed lower mold member which composes a mold, closing the mold with the end of the extruded weather strip clamped by a predetermined clamping force, injecting a foamable molding material into the cavity, moving the upper mold member up by an force not more than the clamping amount in the process of foaming of the foamable molding material to reduce clamping of the upper mold member and to enlarge the cavity, continuing molding with the upper mold member moved up until the foamable molding material fills the enlarged cavity, and opening the mold when molding of the molded portion is completed.

Abstract: A refrigeration apparatus cabinet has an outer shell and an inner liner to define an insulation space therebetween. There is an opening through a wall of the liner and opening into the insulation space. An opening through a wall of the shell opens into the insulation space. A wiring harness is provided in the insulation space. The wiring harness comprises a pair of electrical plug-in connectors and a plurality of conductors extending therebetween, one connector being received in the liner wall opening and the other connector being received in the shell wall opening. Foamed-in-place insulation is provided in the insulation space, the connectors sealing the liner wall opening and the shell wall opening to prevent leakage of the foamed-in-place insulation.

Abstract: A gasketing device for forming a molded interior trim component for a vehicle utilizes a flexible planar gasket compressed between mold halves to prevent foaming material from entering the gasket area. The gasket is adapted to be secured to a structural insert and has a flexible peripheral edge that seals against the inside surface of a bezel on the insert. The gasket extends through the opening defined by the bezel to seal against a skin shell. The method includes mounting the gasket on the insert. The insert and gasket are placed on a mold half with an opposing mold half having a skin shell thereon. A foaming formulation is placed between the skin shell and insert and allowed to foam about the gasket to secure the insert to the skin shell. The product is removed, the skin shell over the gasket cut and peeled away to form an opening in the shell dimensioned smaller than the dimensions of the peripheral edge of the gasket.

Abstract: A method of sealing electric parts mounted in a bare state on an electric wiring board uses a liquid sealing resin as a printing ink and a screen serving as screen printing means and having apertures in the same pattern as the electric parts mounted on the board. The lower end of a peripheral wall of the screen defining each of the apertures is substantially brought into line-to-line contact with the surface of the board for screen printing. The screen has a recess formed on the rear side of the line contact portion thereof and surrounding the contact portion. These features prevent the printing ink from adhering to the rear side of the screen and the collapse of the sealing resin layer that would occur if the ink adheres to the screen rear sides.

Abstract: Method and apparatus for producing a molded article of a foamed thermoplastic resin and articles produced thereby. A molten mass of an expandable thermoplastic resin is accumulated in an accumulator while it is prevented from foaming. A quantity of the accumulated foamable melt is extruded through a die orifice having a shape adapted to reflect the shape of the desired finished product. The extruded foamable melt commences foaming as it comes in contact with the atmosphere. As the extruded thermoplastic resin foams, it is pulled vertically downward from the die orifice by gravity. The downward-hanging, foamed, thermoplastic material is captured between the halves of a vertically-oriented mold before the foaming expansion of the foamable melt has been completed. The foamed thermoplastic material is compressed by the vertically-oriented mold into the desired shape.

Abstract: A method of integrating first and second skins into a contiguous cover layer by: providing a first skin with a first surface to be exposed and an opposite backing surface, with the first skin having an offset edge defining a first corner with the exposed part of the first surface; providing a second skin with a second surface to be exposed and an opposite backing surface, with the second skin having an offset edge defining a second corner with the exposed part of the second surface; placing a mold element/partition between the first and second offset skin edges to maintain a space between at least a part of the first and second offset skin edges; pouring a flowable foundation material that will harden against the backing surfaces of the first and second skins so that the hardened foundation material exerts a force tending to urge the first and second corners towards each other; and removing the mold element/partition from between the first and second offset skin edges so that the space between the parts of th

Abstract: In a process and apparatus for the production of a foamed-backed cushion portion comprising a foam core and a cover, a cover portion is introduced into a first mold portion of a mold. The cover portion is secured in position between the first mold portion and a second mold portion along peripherally extending contact portions therebetween, the mold forming a mold cavity when closed. A reaction mixture introduced into the mold cavity foams up and fills the mold cavity and is thus joined to the cover portion. To prevent air from passing out of the mold cavity between the contact portions the mold is sealed in the region of the contact portions by means of a flow of a gaseous flow agent which is directed from the contact portion of at least one mold portion towards the oppositely disposed contact portion of the other mold portion. An elastically yielding sealing element may be provided between the mold portions to improve the sealing action.

Abstract: One or multiple piece golf balls are manufactured by a hot gate injection molding process in which a polymer is injected into a precise cavity defined by mating mold halves. Each individual set of mold halves is selfalignable by means of engageable inclined surfaces on the respective mold halves, which urge the halves into alignment around an axis through the poles, with one of the halves being movable around the axis to enable precise alignment around the parting line. The polymer is injected at a location spaced from the parting line to prevent the formation of a seam or irregular surface at the parting line equator of the ball.

Abstract: A device for at least partially encapsulating a border of a substantially sheet shaped element, and including a mould having at least two parts for pressing therebetween the element. The mould has a shape such that, when the element is pressed between the parts of the mould, a cavity is formed around the border. The device has an injection opening for injecting a moulding substance into the cavity. The cavity is formed by an elastically deformable member having a profile which extends along an encapsulation borderline of the element and which is adapted to be elastically deformed while maintaining a tight contact along the encapsulation borderline when pressure is applied thereon in order to follow irregularities in the element along the borderline. Also, a method for at least partially encapsulating a border of a substantially sheet shaped element.

Abstract: A method for preparing an elastic roller having a layer of elastic material disposed about and integrally molded to a shaft-shaped core metal member, includes the steps of disposing a cylindrical molding device for holding the elastic material, coating the core metal member with an adhesive, and mounting first and second lid members at opposite ends of the molding device. Each lid member holds a respective end of the core metal member so that the core metal member is disposed concentrically within said molding device. A sealing rubber is disposed between each lid member and the core metal member to prevent elastic material from entering a bearing portion of the core metal member, and the elastic material is injected into the molding device. The elastic material is cured, and the lid members are removed such that an extending portion of each lid member removes burrs formed at peripheral end portions of the roller.

Abstract: A method for manufacturing a foam product in which a skin material and a core material having at least one opening are set on upper molding die and lower molding die, respectively, and a foaming resin material is then poured between the skin material and the core material to integrally mold them. A recess is formed on the portion of the upper molding die that corresponds to the opening of the core material. The opening of the core material is covered by an air permeable seal member adhered to the core material. The foaming resin material is then poured in a cavity defined between the molding dies.

Abstract: A method of producing an IC card in which an IC module is embedded, the method including preparing at least one first resin core sheet having a through hole at a position at which the IC module is to be embedded and at least one second resin core sheet having no hole at a position corresponding to the through hole, disposing adhesive sheet having an area greater than that of the through hole on the first resin core sheet covering the through hole, superposing the first and second resin core sheets with the adhesive sheet therebetween, fitting the IC module into the through hole of the first resin core sheet, heating and pressing the IC module and the resin core sheets to form an integral structure, and applying at least one surface protection sheet to the integral structure to complete the card.

Abstract: A molding process of fiber reinforced plastics which includes:placing fiber reinforcements on a half of a mold which has positive pinch-off edges:positioning the mold halves near to each other to grasp the fibers between the pinch-off edges;injecting a resin into a mold cavity through a resin injection opening provided in the mold; andclosing the mold. This process permits the use of low viscosity resins without the escape of the resin from the mold during the impregnation of fiber reinforcements in the mold cavity, so that the process can readily produce in practical manners fiber reinforced plastics with high fiber contents as much as about 50-80% by weight that have not been achieved by the conventional resin injection and mat or preform matched die molding processes.

Abstract: A method for applying a uniform sealant coating over the portion of a fastener exposed above a panel includes applying a sealant retaining shell over the exposed portion of the fastener to define a closed volume between the shell, fastener and panel. The shell has an aperture, removed from the mouth of the shell, for receiving sealant therethrough. An injection nozzle receiving structure for receiving a sealant injector nozzle therein is provided adjacent and substantially aligned with the aperture. Sealant is injected into the shell through the injection nozzle receiving structure and through the aperture therein to fill the area between the fastener and the shell. A pressure is selected for injecting the sealant such that injection is stopped when the shell is filled. The sealant is allowed to cure and the retaining shell is removed.

Abstract: A preformed part made of plastics material, especially a sheet-like plastics part made by injection molding is formed to be integral with elastic portions. The elastic portions serve as seals, as for feed-through holes in the plastics part. A ring-shaped circular closed protruding edge or ring-shaped rib, formed integrally with the plastics part around the regions to be coated with rubber, limit the region where elastic material is deposited to integrate with the plastics material. An annular region around rib has a radial span around the recesses, bore holes or edges into which the rubber material is injected, and enables insertion of the elastic material despite the presence of differential thermal expansion between the plastic part and a metal forming tool to shape the elastic material.

Abstract: A mold assembly for molding vinyl skin shell-covered and foam-filled products, such as an automotive instrument panel, wherein waste portions of the shell and foam are eliminated from the molded product. This eliminates having to manually trim such portions from the finished product after molding. Specifically, compressible foam or silicone rubber gaskets or spacers of predetermined shaped, such as the shape of an opening suitable for a radio speaker, are placed in the mold and compressed between the mold lid and the bottom surface of the mold cavity.

Abstract: A method of producing a discarding propelling cage sabot projectile, and to a discarding propelling cage sabot projectile produced according to this method, in which, in a vulcanizing tool including an injection mold, a uniformly thin layer of rubber is applied to the rear gas pressure receiving surface of the sabot so as to secure and seal the individual sabot segments against one another. In such a method, when the liquid sealing material is injected into the injection mold, there exists the danger that, due to the high pressure existing at that time, sealing material may enter, in an uncontrolling manner, into the cylindrical inner annular gap or annulus between the sabot and the projectile body. This may considerably adversely influence the release behavior of the discarding sabot segments and lead to a reduction of hit accuracy.

Abstract: A method of producing a cavity package semiconductor device is disclosed. The method includes providing a bar pad having a plurality of bar pad straps, each strap extending outwardly from the outer edge of the bar pad and spaced about the edge of the bar pad; mounting integrated circuits having bond pads on the bar pad; molding a packing material onto a central portion of lead fingers and the bar straps to grip and surround each lead finger with package material, with a portion of each lead finger extending externally from the ring at both the exterior and interior thereof and to secure the bar pad straps therein; electrically coupling the bond pads to the portion of desired ones of the lead fingers extending toward the interior of the ring; and enclosing both ends of the ring to provide a cavity in the ring to suspend a bar pad with the integrated circuit thereon within the cavity with the bar pad straps.

Abstract: An apparatus for sealing around an insert in a molded part to avoid the escape of flash including a mold cavity cooperatively defined by at least two mold blocks, at least one of the mold blocks having at least one insert opening communicating with the cavity. A plunger chamber is substantially co-axial to the insert opening and communicates with the cavity via the insert opening, the plunger chamber having generally greater radial dimensions than the insert opening, thereby defining a generally inwardly-directed flange with respect to the walls of the plunger chamber. The surface of the flange remote from the cavity constitutes a seating surface within the insert opening. A resilient seal is fitted within the plunger chamber against the seating surface in proximity to the insert. A plunger is positioned within the plunger chamber for relative movement generally towards and away from the cavity to compress the resilient seal against the seating surface.

Abstract: A method for molding a gasket or casing around a peripheral portion of sheet material with portions of a separate part embedded within the gasket and other portions extending out of the gasket is disclosed. Preferably, the method is used to form vehicular window assemblies and includes inserting a separate part in a pocket or recess in one of two cooperating mold sections prior to closing the mold, closing the mold such that a portion of the separate part is urged tightly against a part of the recess by the sheet material in the mold, and filling the mold cavity to embed part of the separate part in the gasket while another portion extends out of the cavity.

Abstract: A method for making fluid seals with a mold which includes an outside diameter surface on a fixed part and a seal flange support surface on another portion of the fixed part. A seal casing with a shouldered mounting flange having major and minor out side diameters and a radial flange is positioned in the fixed mold part. A movable mold member includes an upper, outer cylindrical surface for engaging the inside surface of the casing major diameter to form a flash barrier which moves during mold closure. Both the fixed mold part and the movable mold part include inwardly directed surfaces defining the mold cavity; the flange support is apertured for the elastomer to flow from the seal body-forming part of the cavity to the gasket-forming part of the cavity. The heel-forming cavity part lies between the lower part of the insides surface of the mold and the outer surface of the casing minor diameter.

Abstract: An improvement for a process wherein a strip of fastener material is formed into the surface of urethane foam or the like during molding in a mold. The fastener material includes a backing strip having an outer surface adapted to mate with the foam material during molding and a fastener strip having an outer surface comprising one-half of a fastening system such as hook and loop fastening material. The backing strip and the fastener strip are attached to one another with their respective inner surfaces in face-to-face relationship with their outer surfaces facing outward. The fastener material fits within a longitudinal groove in the mold and the backing material overlaps the groove.

Abstract: A method for making a steering wheel including a ring portion comprising a ring portion metal care having a plurality of angular portions in the transverse cross-section thereof. The ring portion metal core is provided in such a way that one of the diagonal lines which connect its angular portions is substantially parallel to the surface of a ring which is defined by connecting the entire periphery of the front edge of a ring portion in the diametral direction. A covering layer is covered on the surface of the ring portion metal core, and at least one spoke portion metal core is provided for mounting said ring portion on the steering shaft. The mold for molding the plastic covering on the ring core parts along a plane which includes the above-mentioned on diagonal line.

Abstract: The threads of a nut on a multithreaded, high helix lead screw are formed by disposing a nut over a lead screw where the center hole of the nut is larger than the threads of the lead screw. Polymer material is filled into the space between the nut and the lead screw and cured to form a high helix, multithreaded nut which has threads complimentary to the threads of the lead screw.

Abstract: The formation of flash during plastic encapsulation of electronic devices may be reduced or eliminated and the mold made substantially self-cleaning by modifying the mold chases so that the edges of the channels, runners, gates, and/or other locations containing plastic have a wedge shaped edge region extending to the parting plane of the mold. The wedge angle is desirably in the range 15-30 degrees, measured with respect to the parting plane. The length of the wedge should be sufficient to provide for heating of the thermosetting plastic flowing therein, with about 0.05 inches (1.3 mm) being useful for typical dual-in-line, surface mount, flat pack, or other types of semiconductor device and integrated circuit package molds. The plastic flowing into the wedges shaped region solidifies more rapidly than the plastic in the main channel, thereby damming the wedge to prevent flash formation at the mold parting line at the edges of the plastic containing regions.

Abstract: A lead frame for applying micro-electronic elements thereon, which lead frame comprises a series of lead patterns disposed at mutually equal pitch distances, each consisting of a carrier plate lying on the axis of the frame for applying a micro-electronic element thereto, further of leads terminating a short distance from said carrier plate, said leads being connected to lands extending perpendicularly to the frame axis and disposed on either side of the carrier plate, said leads extending beyond said lands in mutually parallel relationship so as to form lead terminals, as far as the next land of the adjoining lead pattern and being connected thereto, while the parallel leads of adjoining patterns are shifted relatively to each other in transverse direction: the mutual distance between two lands associated with one lead pattern is equal to the width of the standardized resin envelope of the micro-electronic element, the lands being provided with cuts in a direction approximately parallel to the axis of the le

Abstract: The invention is a mold adapted for forming a member from a thermoset or thermoplastic resin about a substrate at a distance from the end of the substrate without leaking of the thermoplastic or thermoset material onto the portion of the substrate between the end and the starting point of the member being formed about the substrate, wherein the mold comprises(A) a mold casing adapted for forming a member from a thermoset or thermoplastic material about a substrate at a distance from the end of the substrate,(B) an inflatable seal adapted for forming a seal about the substrate when inflated at a distance from the end of the substrate such that the thermoset or thermoplastic material is contained to the area of the substrate about which the member is to be formed,(C) a means for inflating the seal such that the seal can form a seal about the substrate at a distance from the end of the substrate.

Abstract: Electrical components permanently applied to terminal carrier plates are cast with casting resin in a casting mould. The mould includes (a) a lower mould component, provided with a silicon rubber layer containing recesses for receiving the carrier plates, (b) a central mould component which is to be clamped down onto the lower mould component and is provided with chambers which are open at the top and at the bottom and which accommodate the electrical components to be cast, and (c) an upper mould component which is provided with flow openings for the common casting resin sprue. The invention can be used, for example, in the production of small annular core coils which are later to be used in film circuits.

Abstract: In production of a golf club head by heat pressing of a compound in a splittable mould, the compound of a fixed weight is injected into the mould cavity through an injection tube which is clamped by the mould and removed after appreciable hardening of the compound. Provision of an asylum for extra bulk of compound by the injection tube remarkably reduces production of undesirable dregs or flash at heat pressing. The injection tube also serves to define the correct positioning of a core used in the product.

Abstract: An injection mold for producing a plastic injection molding having a layer of plastic molding material on the front of a metallic support. The injection mold has a first mold half over the front of the support with a mold cavity therein for holding the injected plastic material which forms the layer on the front of the support. The injection mold has a second mold half at the rear of the support with another recess for being filled with pressure fluid for pressing the front of the support against the first mold half, which seals the cavity for the injected plastic molding material to prevent leakage and to keep the line of the plastic material layer around the mold cavity on the support sharp. The pressure fluid may be supplied to the rear of the support before the molding composition is injected into the cavity at the front of the support. The pressure fluid at the rear of the support may be the same material that is applied on the front of the support.

Abstract: Injection or transfer molding of plastic is performed in a manner that virtually eliminates flash. Deflection of the mold press is measured with the mold press in a clamping configuration. Then the support structure of the molds is arranged to apply an equal force to the mold face by configuring supporting pillars and bars such that they act as individual springs. Their spring constants and/or lengths are calculated to account for the actual deflection found in the mold press, thereby, producing a uniform pressure on the molds during clamping of the press.

Abstract: A method for manufacturing a resin-sealed semiconductor device wherein after a semiconductor pellet is sealed to a leadframe with a resin, outer leads projected from the leadframe and adhered with burrs are collapsed by their upper or upper and lower corners and then the burrs are removed by blasting.

Abstract: As arc section of the casing 11 of a tire 10 to be retreaded is engaged on the outside by a mold element 15 defining a hollow mold chamber 17 and on the inside by a mushroom shaped counter mold element 16 configured to the inner contour of the casing. The relatively movable elements 15 and 16 are pressed towards each other to seal the chamber 17, and tread rubber is injected into the chamber and vulcanized to the casing. The mold elements are then retracted and the casing is rotated to a fresh arc section to thus retread the entire casing circumference in a stepped or successive manner.